Tom has said he would be willing to drive across town in order to save $10 on the purchase price of a $20 clock radio. If Tom is rational, this implies that he

a. Believes that the opportunity cost of the trip is not more than $10.

b. Should also drive across town to save $10 on a $500 television set.

c. Should not drive across town to save $10 on a $500 television set.

d. Should drive across town only if the savings on a $500 television set is at least $250.

e. More than one of the above are correct.